fix(builder): correct move and sortable behavior

packages/block-editor/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@wrnexus/block-editor",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "type": "module",
   "description": "Hydrated accessible editor runtime for WRNexus block documents.",
   "exports": {

packages/block-editor/src/runtime.ts

@@ -49,8 +49,11 @@ export function mountBlockEditor(root: HTMLElement, options: MountEditorOptions)
       const parent = element.dataset.blockParent!;
       const slot = element.dataset.blockSlot!;
       const siblings = [
-        ...element.parentElement!.querySelectorAll<HTMLElement>(":scope > [data-block-id]"),
-      ];
+        ...root.querySelectorAll<HTMLElement>("[data-block-id][data-block-parent][data-block-slot]"),
+      ].filter(
+        (candidate) =>
+          candidate.dataset.blockParent === parent && candidate.dataset.blockSlot === slot,
+      );
       const handle = element.querySelector<HTMLElement>("[data-block-handle]") ?? undefined;
       cleanups.push(
         manager.registerSortable({